// Scintilla source code edit control
/** @file Platform.h
 ** Interface to platform facilities. Also includes some basic utilities.
 ** Implemented in PlatGTK.cxx for GTK+/Linux, PlatWin.cxx for Windows, and PlatWX.cxx for wxWindows.
 **/
// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef PLATFORM_H
#define PLATFORM_H

// PLAT_GTK = GTK+ on Linux or Win32
// PLAT_GTK_WIN32 is defined additionally when running PLAT_GTK under Win32
// PLAT_WIN = Win32 API on Win32 OS
// PLAT_WX is wxWindows on any supported platform

#define PLAT_GTK 0
#define PLAT_GTK_WIN32 0
#define PLAT_WIN 0
#define PLAT_WX  1
#define PLAT_FOX 0

#if defined(FOX)
#undef PLAT_FOX
#define PLAT_FOX 1

#elif defined(__WX__)
#undef PLAT_WX
#define PLAT_WX  1
#undef PLAT_WIN

#elif defined(GTK)
#undef PLAT_GTK
#define PLAT_GTK 1
#undef PLAT_WX
#define PLAT_WX  1

#ifdef _MSC_VER
#undef PLAT_GTK_WIN32
#define PLAT_GTK_WIN32 1
#endif

#else
#undef PLAT_WIN
#define PLAT_WIN 1

#endif


// Underlying the implementation of the platform classes are platform specific types.
// Sometimes these need to be passed around by client code so they are defined here

typedef void *FontID;
typedef void *SurfaceID;
typedef void *WindowID;
typedef void *MenuID;
typedef void *TickerID;
typedef void *Function;
typedef void *IdlerID;

/**
 * A geometric point class.
 * Point is exactly the same as the Win32 POINT and GTK+ GdkPoint so can be used interchangeably.
 */
class Point {
public:
        int x;
        int y;

        explicit Point(int x_=0, int y_=0) : x(x_), y(y_) {
        }

        // Other automatically defined methods (assignment, copy constructor, destructor) are fine

        static Point FromLong(long lpoint);
};

/**
 * A geometric rectangle class.
 * PRectangle is exactly the same as the Win32 RECT so can be used interchangeably.
 * PRectangles contain their top and left sides, but not their right and bottom sides.
 */
class PRectangle {
public:
        int left;
        int top;
        int right;
        int bottom;

        PRectangle(int left_=0, int top_=0, int right_=0, int bottom_ = 0) :
                left(left_), top(top_), right(right_), bottom(bottom_) {
        }

        // Other automatically defined methods (assignment, copy constructor, destructor) are fine

        bool operator==(PRectangle &rc) {
                return (rc.left == left) && (rc.right == right) &&
                        (rc.top == top) && (rc.bottom == bottom);
        }
        bool Contains(Point pt) {
                return (pt.x >= left) && (pt.x <= right) &&
                        (pt.y >= top) && (pt.y <= bottom);
        }
        bool Contains(PRectangle rc) {
                return (rc.left >= left) && (rc.right <= right) &&
                        (rc.top >= top) && (rc.bottom <= bottom);
        }
        bool Intersects(PRectangle other) {
                return (right > other.left) && (left < other.right) &&
                        (bottom > other.top) && (top < other.bottom);
        }
        void Move(int xDelta, int yDelta) {
                left += xDelta;
                top += yDelta;
                right += xDelta;
                bottom += yDelta;
        }
        int Width() { return right - left; }
        int Height() { return bottom - top; }
};

/**
 * In some circumstances, including Win32 in paletted mode and GTK+, each colour
 * must be allocated before use. The desired colours are held in the ColourDesired class,
 * and after allocation the allocation entry is stored in the ColourAllocated class. In other
 * circumstances, such as Win32 in true colour mode, the allocation process just copies
 * the RGB values from the desired to the allocated class.
 * As each desired colour requires allocation before it can be used, the ColourPair class
 * holds both a ColourDesired and a ColourAllocated
 * The Palette class is responsible for managing the palette of colours which contains a
 * list of ColourPair objects and performs the allocation.
 */

/**
 * Holds a desired RGB colour.
 */
class ColourDesired {
        long co;
public:
        ColourDesired(long lcol=0) {
                co = lcol;
        }

        ColourDesired(unsigned int red, unsigned int green, unsigned int blue) {
                Set(red, green, blue);
        }

        bool operator==(const ColourDesired &other) const {
                return co == other.co;
        }

        void Set(long lcol) {
                co = lcol;
        }

        void Set(unsigned int red, unsigned int green, unsigned int blue) {
                co = red | (green << 8) | (blue << 16);
        }

        static inline unsigned int ValueOfHex(const char ch) {
                if (ch >= '0' && ch <= '9')
                        return ch - '0';
                else if (ch >= 'A' && ch <= 'F')
                        return ch - 'A' + 10;
                else if (ch >= 'a' && ch <= 'f')
                        return ch - 'a' + 10;
                else
                        return 0;
        }

        void Set(const char *val) {
                if (*val == '#') {
                        val++;
                }
                unsigned int r = ValueOfHex(val[0]) * 16 + ValueOfHex(val[1]);
                unsigned int g = ValueOfHex(val[2]) * 16 + ValueOfHex(val[3]);
                unsigned int b = ValueOfHex(val[4]) * 16 + ValueOfHex(val[5]);
                Set(r, g, b);
        }

        long AsLong() const {
                return co;
        }

        unsigned int GetRed() {
                return co & 0xff;
        }

        unsigned int GetGreen() {
                return (co >> 8) & 0xff;
        }

        unsigned int GetBlue() {
                return (co >> 16) & 0xff;
        }
};

/**
 * Holds an allocated RGB colour which may be an approximation to the desired colour.
 */
class ColourAllocated {
        long coAllocated;

public:

        ColourAllocated(long lcol=0) {
                coAllocated = lcol;
        }

        void Set(long lcol) {
                coAllocated = lcol;
        }

        long AsLong() const {
                return coAllocated;
        }
};

/**
 * Colour pairs hold a desired colour and an allocated colour.
 */
struct ColourPair {
        ColourDesired desired;
        ColourAllocated allocated;

        ColourPair(ColourDesired desired_=ColourDesired(0,0,0)) {
                desired = desired_;
                allocated.Set(desired.AsLong());
        }
        void Copy() {
                allocated.Set(desired.AsLong());
        }
};

class Window;   // Forward declaration for Palette

/**
 * Colour palette management.
 */
class Palette {
        int used;
        int size;
        ColourPair *entries;
#if PLAT_GTK
        void *allocatedPalette; // GdkColor *
        int allocatedLen;
#endif
        // Private so Palette objects can not be copied
        Palette(const Palette &) {}
        Palette &operator=(const Palette &) { return *this; }
public:
#if PLAT_WIN
        void *hpal;
#endif
        bool allowRealization;

        Palette();
        ~Palette();

        void Release();

        /**
         * This method either adds a colour to the list of wanted colours (want==true)
         * or retrieves the allocated colour back to the ColourPair.
         * This is one method to make it easier to keep the code for wanting and retrieving in sync.
         */
        void WantFind(ColourPair &cp, bool want);

        void Allocate(Window &w);
};

/**
 * Font management.
 */
class Font {
protected:
        FontID id;
#if PLAT_WX
        int ascent;
#endif
        // Private so Font objects can not be copied
        Font(const Font &) {}
        Font &operator=(const Font &) { id=0; return *this; }
public:
        Font();
        virtual ~Font();

        virtual void Create(const char *faceName, int characterSet, int size,
                bool bold, bool italic, bool extraFontFlag=false);
        virtual void Release();

        FontID GetID() { return id; }
        // Alias another font - caller guarantees not to Release
        void SetID(FontID id_) { id = id_; }
        friend class Surface;
        friend class SurfaceImpl;
};

/**
 * A surface abstracts a place to draw.
 */
class Surface {
private:
        // Private so Surface objects can not be copied
        Surface(const Surface &) {}
        Surface &operator=(const Surface &) { return *this; }
public:
        Surface() {};
        virtual ~Surface() {};
        static Surface *Allocate();

        virtual void Init(WindowID wid)=0;
        virtual void Init(SurfaceID sid, WindowID wid)=0;
        virtual void InitPixMap(int width, int height, Surface *surface_, WindowID wid)=0;

        virtual void Release()=0;
        virtual bool Initialised()=0;
        virtual void PenColour(ColourAllocated fore)=0;
        virtual int LogPixelsY()=0;
        virtual int DeviceHeightFont(int points)=0;
        virtual void MoveTo(int x_, int y_)=0;
        virtual void LineTo(int x_, int y_)=0;
        virtual void Polygon(Point *pts, int npts, ColourAllocated fore, ColourAllocated back)=0;
        virtual void RectangleDraw(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
        virtual void FillRectangle(PRectangle rc, ColourAllocated back)=0;
        virtual void FillRectangle(PRectangle rc, Surface &surfacePattern)=0;
        virtual void RoundedRectangle(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
        virtual void AlphaRectangle(PRectangle rc, int cornerSize, ColourAllocated fill, int alphaFill,
                ColourAllocated outline, int alphaOutline, int flags)=0;
        virtual void Ellipse(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
        virtual void Copy(PRectangle rc, Point from, Surface &surfaceSource)=0;

        virtual void DrawTextNoClip(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
        virtual void DrawTextClipped(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
        virtual void DrawTextTransparent(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore)=0;
        virtual void MeasureWidths(Font &font_, const char *s, int len, int *positions)=0;
        virtual int WidthText(Font &font_, const char *s, int len)=0;
        virtual int WidthChar(Font &font_, char ch)=0;
        virtual int Ascent(Font &font_)=0;
        virtual int Descent(Font &font_)=0;
        virtual int InternalLeading(Font &font_)=0;
        virtual int ExternalLeading(Font &font_)=0;
        virtual int Height(Font &font_)=0;
        virtual int AverageCharWidth(Font &font_)=0;

        virtual int SetPalette(Palette *pal, bool inBackGround)=0;
        virtual void SetClip(PRectangle rc)=0;
        virtual void FlushCachedState()=0;

        virtual void SetUnicodeMode(bool unicodeMode_)=0;
        virtual void SetDBCSMode(int codePage)=0;
};

/**
 * A simple callback action passing one piece of untyped user data.
 */
typedef void (*CallBackAction)(void*);

/**
 * Class to hide the details of window manipulation.
 * Does not own the window which will normally have a longer life than this object.
 */
class Window {
protected:
        WindowID id;
public:
        Window() : id(0), cursorLast(cursorInvalid) {}
        Window(const Window &source) : id(source.id), cursorLast(cursorInvalid) {}
        virtual ~Window();
        Window &operator=(WindowID id_) {
                id = id_;
                return *this;
        }
        WindowID GetID() const { return id; }
        bool Created() const { return id != 0; }
        void Destroy();
        bool HasFocus();
        PRectangle GetPosition();
        void SetPosition(PRectangle rc);
        void SetPositionRelative(PRectangle rc, Window relativeTo);
        PRectangle GetClientPosition();
        void Show(bool show=true);
        void InvalidateAll();
        void InvalidateRectangle(PRectangle rc);
        virtual void SetFont(Font &font);
        enum Cursor { cursorInvalid, cursorText, cursorArrow, cursorUp, cursorWait, cursorHoriz, cursorVert, cursorReverseArrow, cursorHand };
        void SetCursor(Cursor curs);
        void SetTitle(const char *s);
private:
        Cursor cursorLast;
};

/**
 * Listbox management.
 */

class ListBox : public Window {
public:
        ListBox();
        virtual ~ListBox();
        static ListBox *Allocate();

        virtual void SetFont(Font &font)=0;
        virtual void Create(Window &parent, int ctrlID, Point location, int lineHeight_, bool unicodeMode_)=0;
        virtual void SetAverageCharWidth(int width)=0;
        virtual void SetVisibleRows(int rows)=0;
        virtual int GetVisibleRows() const=0;
        virtual PRectangle GetDesiredRect()=0;
        virtual int CaretFromEdge()=0;
        virtual void Clear()=0;
        virtual void Append(char *s, int type = -1)=0;
        virtual int Length()=0;
        virtual void Select(int n)=0;
        virtual int GetSelection()=0;
        virtual int Find(const char *prefix)=0;
        virtual void GetValue(int n, char *value, int len)=0;
        virtual void RegisterImage(int type, const char *xpm_data)=0;
        virtual void ClearRegisteredImages()=0;
        virtual void SetDoubleClickAction(CallBackAction, void *)=0;
        virtual void SetList(const char* list, char separator, char typesep)=0;
};

/**
 * Menu management.
 */
class Menu {
        MenuID id;
public:
        Menu();
        MenuID GetID() { return id; }
        void CreatePopUp();
        void Destroy();
        void Show(Point pt, Window &w);
};

class ElapsedTime {
        long bigBit;
        long littleBit;
public:
        ElapsedTime();
        double Duration(bool reset=false);
};

/**
 * Dynamic Library (DLL/SO/...) loading
 */
class DynamicLibrary {
public:
        virtual ~DynamicLibrary() {};

        /// @return Pointer to function "name", or NULL on failure.
        virtual Function FindFunction(const char *name) = 0;

        /// @return true if the library was loaded successfully.
        virtual bool IsValid() = 0;

        /// @return An instance of a DynamicLibrary subclass with "modulePath" loaded.
        static DynamicLibrary *Load(const char *modulePath);
};

/**
 * Platform class used to retrieve system wide parameters such as double click speed
 * and chrome colour. Not a creatable object, more of a module with several functions.
 */
class Platform {
        // Private so Platform objects can not be copied
        Platform(const Platform &) {}
        Platform &operator=(const Platform &) { return *this; }
public:
        // Should be private because no new Platforms are ever created
        // but gcc warns about this
        Platform() {}
        ~Platform() {}
        static ColourDesired Chrome();
        static ColourDesired ChromeHighlight();
        static const char *DefaultFont();
        static int DefaultFontSize();
        static unsigned int DoubleClickTime();
        static bool MouseButtonBounce();
        static void DebugDisplay(const char *s);
        static bool IsKeyDown(int key);
        static long SendScintilla(
                WindowID w, unsigned int msg, unsigned long wParam=0, long lParam=0);
        static long SendScintillaPointer(
                WindowID w, unsigned int msg, unsigned long wParam=0, void *lParam=0);
        static bool IsDBCSLeadByte(int codePage, char ch);
        static int DBCSCharLength(int codePage, const char *s);
        static int DBCSCharMaxLength();

        // These are utility functions not really tied to a platform
        static int Minimum(int a, int b);
        static int Maximum(int a, int b);
        // Next three assume 16 bit shorts and 32 bit longs
        static long LongFromTwoShorts(short a,short b) {
                return (a) | ((b) << 16);
        }
        static short HighShortFromLong(long x) {
                return static_cast<short>(x >> 16);
        }
        static short LowShortFromLong(long x) {
                return static_cast<short>(x & 0xffff);
        }
        static void DebugPrintf(const char *format, ...);
        static bool ShowAssertionPopUps(bool assertionPopUps_);
        static void Assert(const char *c, const char *file, int line);
        static int Clamp(int val, int minVal, int maxVal);
};

#ifdef  NDEBUG
#define PLATFORM_ASSERT(c) ((void)0)
#else
#define PLATFORM_ASSERT(c) ((c) ? (void)(0) : Platform::Assert(#c, __FILE__, __LINE__))
#endif

// Shut up annoying Visual C++ warnings:
#ifdef _MSC_VER
#pragma warning(disable: 4244 4309 4514 4710)
#endif

#endif
